Merge branch 'jonas_master' into refactor_test_1

handlers/home.go

@@ -11,8 +11,14 @@ func Home(w http.ResponseWriter, r *http.Request) {
 	sessionId := vars["sessionId"]
 
 	s := core.SessionGet(sessionId)
+	if s == nil {
+		// Session doesn't exist (can happen if closing the sessions an reloading the page, or similar).
+		w.WriteHeader(http.StatusNotFound)
+		return
+	}
 	if s.Stack != "" {
 		go core.SessionDeployStack(s)
 	}
+
 	http.ServeFile(w, r, "./www/index.html")
 }